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NTE21256 Datasheet(PDF) 3 Page - NTE Electronics

Part No. NTE21256
Description  262,144-Bit Dynamic Random Access Memory (DRAM)
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Manufacturer  NTE [NTE Electronics]
Direct Link  http://www.nteinc.com
Logo NTE - NTE Electronics

NTE21256 Datasheet(HTML) 3 Page - NTE Electronics

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DC Characteristics: (TA = 0° to +70°C, VSS = 0V, VCC = +5V ±10% unless otherwise specified)
Parameter
Symbol
Test Conditions
Min
Typ
Max
Unit
Input High Voltage (All Inputs)
VIH
Notes 2, Note3
2.4
VCC +1
V
Input Low Voltage (All Inputs)
VIL
Notes 2, Note3
–1.0
0.8
V
Output High Voltage
VOH
Note 4
2.4
V
Output Low Voltage
VOL
Note 5
0.4
V
Average VCC Supply Current
ICC1
tRC = 260ns, Note 6
70
mA
Standby VCC Supply Current
ICC2
Note 7
5
mA
Average VCC Supply Current during
RAS–only refresh cycles
ICC3
Note 6
65
mA
Average VCC supply Current during
Page Mode
ICC4
Note 6
55
mA
Input Leakage Current (Any Input)
II (L)
10
µA
Output Leakage Current
IO (L)
CAS at Logic 1, 0
≤ V out ≤ 5.5
10
µA
Supply Voltage
VCC
Note 2
4.5
5.5
V
VSS
0
0
V
Note 2. All voltages referenced to VSS.
Note 3. Overshooting and undershooting on input levels of +6.5V or –2V for a period 0f 30ns Max.
will influence function and reliability of the device.
Note 4. IOH = 4mA and 100pf load.
Note 5. IOL = 4mA and 100pf load.
Note 6. ICC depends on frequency of operation. Maximum current is measured at the fastest cycle
rate.
Note 7. RAS and CAS are both at VIH.
Capacitance: (Note 6)
Parameter
Symbol
Test Conditions
Min
Typ
Max
Unit
Input Capacitance (A0–A8, DI)
CI1
6
pF
Input Capacitance (RAS, CAS, WE)
CI2
7
pF
Output Capacitance (DO, CAS = VIH to disable output)
CO
7
pF
Note 6. Effective capacitance calculated from the equation:
C =
I
• ∆t
∆V
with
∆V = 3V or measured with Boonton meter.
AC Test Conditions:
Input Pulse Levels
0 to 3.0V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input Rise and Fall Times
5ns between 0.8 and 2.4V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input Timing Reference Levels
0.8 to 2.4V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output Timing Reference Levels
0.4 to 2.4V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output Load
equivelent to 2 standard TTL loads and 100pf
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .


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